16 



51a. 



Above chocolate broAvn ; tail blackish, -with 



3 narrow white bands ; l)elow thickly barred 



\Aith black and white ; throat brown. 



Micrastur ruficollis zonothorax (Cab.), J.f.O., Colombia, 



1865, p. 406. Venezuela 



Barred Harrier-Hawk. 



Above (male) ashy brown, (female blackish) ; 

 tail blackish with 4 irregular white bands ; 

 beloAV whitish, breast finely barred with wavy 

 blackish lines ; lower abdomen Avhite. 

 52. Micrastur gilvicollis (Vieill.), N. Diet., x., p. 

 323 (1817). 

 White -throated Harrier-Hawk. 



Above blackish ; tail with 3 irregular white 

 bands ; throat and cheeks pale grey ; below 

 dull white, closely barred on breast and less so 

 on abdomen with blackish. 

 53. Micrastur guerilla guerilla, Cass.,Pr. Phil. Acad., 

 1848, p. 87. 

 Grey-throated Harrier-Hawk. 



S. America 

 from 



Colombia & 

 Amazonia to 

 E. Pern and 

 to 20° S. lat. 

 in Brazil. 



Mexico, 



Guatemala, 



Honduras. 



Above greyer ; chest suffused with rnfescent 

 buff. 

 53a. Micrastur guerilla jugularis Gurney; List Brazil, 



Diurnal Bds. Prey, pp. 25, 117 (1884). Venezuela, 



Rufous-chested Harrier-Hawk. Colombia. 



53 b. 



Slightly larger than M. g. guerilla ; less pure 



white below, and dusky bars broader and 



heavier, especially on belly, thighs and under 



tail-coverts. 



Micrastur guerilla interstes Bangs, Auk, 1907, 



p. 289. 



Bangs's Harrier-Hawk. 



Costa Rica to 

 Colombia and 

 Ecuador. 



Gen. XX GERANOSPIZIAS Sundev. (1873). 



Tarsus scaled bennia ; thighs without over- 

 hanging tuft of feathers ; ridge of bill greater 

 than half length of middle toe (without claw) ; 

 commissure slightly festooned. 

 Size moderate (length 16.5-24.5 in.). 



